Invalid signature detected red box warning

[dunkinidaho]

New Dell i7559 laptop that I just installed 250gb Samsung m.2 and replaced the conventional hdd with a Samsung 850evo 500gb drive. Now trying to load win7pro and getting the red box warning, invalid signature. Needing step by step instructions here on how to procede. I can also remove the ssd's and restore back to oem, then take it to the shop which I'd rather not do.

Thanks

 

[alphanumeric]

Have a look at this, http://www.sevenforums.com/tutorial...e-firmware-interface-install-windows-7-a.html It sounds like a UEFI Secure Boot issue.